If we bring in a heavyweight, would it not spell the end for White? Is there room on a team for a goon, plus White, plus Prust? At a certain point aren't we making redundancies?

I'm not being rhetorical, I'd like to know what kind of roster shuffling we'd have to do to accomodate the addition of a heavy like Kassian.

White is a centre that can easy play on a 4th line. A heavyweight will not take is spot. If you want a tough team, you need multiple tough guy, not just 1 or 2. White toughness is a bonus. If you want to switch him with a softy, we will be at the same point than before